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(No Modem I -G.AYLGER 'Hoff BLAST'STOVB FOR BLAST PURNAGES.v NVQ.:289,952.1,l V JfPatented D5e'c.1-1,"18183.

i l fi U W N. PETER; Photu'uuwgnpmn wulningtnn, D. c

UNITED vSTATES rPATEixVr OFFICE.

OHARLESALGER, OF HUDSON, NEVA YORK.

HOT-BLAST lsT-ovt: vFOR BVLAsT-FURNACES.

SPECIFICATION forming part of .Letters Patent No. 289,952, dated December 11, 1883.

' Application filed May 3, 1383. (No model.)

T0 all whom, tm/ay concern.:

Be it known that I,'CHARLEs ALGER', of Hudson, in the county of Columbia and State of New York, have invented a new and useful Improvement in Hot-Blast `Stoves for Blast- Furnaces, -of whichl the following is a full,

clear, and exact description.v

Iteferenceis to bel had to fthe accompanying drawings, forming a part of this specification, in which similar letters Vof reference indicate corresponding partsvin all the figures.

Figure 1 is a sectional side elevation of `m y improvement, parts being broken away. Fig. 1

2 is a sectional end view of the same, taken through the line .r x, Fig. `l.

the air-heating pipes, as hereinafter more fully set forth, and pointed out in the claims.

A represents the walls ofthe heating-cham'- leading. in through the upper arm of the pipe F, and the amount of air admitted is regulated by a damper or,\-'alve, I, pivoted tothe pipe F, so that it can be turned to partly or wholly cover theends of the said pipes H. The in-v combustible products vof combustion escape from the heating-chamber B through the chimv neys J, placed at the side parts of the top of the said chamber B, and which are provided with valves K, operated by levers L, and chains M, so that the said chimneys can be opened and closed as required.

Within the heating-chamber B, at the opposite sides of the row of apertures C, are placed two rows of inverted U-pipes N, the adjacent ends of which are connected by short return- Fig.3 is a sec-l tional plan lView of an arm of one` ofthe pipes,V

V.connections O, so that the blast will pass suc;

cessively through all the pipes of each row. The rst connection O of each row of pipes N is connected'by a pipe, P, with the pipe Q,y leading from a blast-blowing engine or engines. rIhe last connectionO'of each row of pipes, N, isi-connected by a pipe, B, with the pipe SL, leading to the blast-furnace. The entrance of the cold blast into the stove is `regulated by a valve, T, placed in thepipe l?, and the passage of the heated blast to the furnace is regulated by a valve, U, Aplaced in the pipe B. The U-pipesN are lined with'ire-bricks V, vwhich are made of vdifferent widths, so as to form a rough inner surface, as shown in Figs. 3 and ,4,- and thus cause a thorough interminthrough the said pipes. The outer surfaces so as to thoroughly protect the said pipes from the heat. y

Two or more heating-chambers, B, and combustion-chambers D, and their pipes and other appliances can be connected lwith the same desired. With this construction the blast can be heated to and kept at any desired temperature withacomparatively small amount of waste furnace-gases or fuel, and without any injury to the various parts of the stove.

The U-pipes N can be made of wroughtiron, if desired, to allow them to be made to prevent them from being cracked and broken `bythe heat.

y YHaving thus fully described 1ny invention, I claim as new and desire to secure by Letters Patentthe metallic air-heating U-pipes N, facedy inside and outside withre-bricks, substantially said pipes from being injured by the heat, as set forth.

2. In ahot-blast stove fornblastlfurnaces, the metallic air-heating U-pipes N, faced outside with flre-bricks W, and faced inside with fire-bricks V, made of diii'erent widths, so as purpose set forth. Y CHAS. ALGER. lVitnesses:

ABRAHAM S. PRET,

GRANVILL HILLs.

inlet and'outlet blast-pipes QS, as may be.

lighter than would otherwise be possible, and

gling and even heating. of th'ef air passing of the pipes N are faced with hre-bricks W,

l. In a hot-blastY stove for blast-furnaces,

as, herein shown anddescribed, to prevent the to form a rough inner'surface,A substantially as described, and for the 

